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/* load_webp.c - load WEBP image from file
*
* Raster graphics library
*
* Copyright (c) 2014-2021 Window Maker Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <webp/decode.h>
#include "wraster.h"
#include "imgformat.h"
#include "wr_i18n.h"
/*
* webp_message_from_status
*
* return the text message from a VP8 status code
*/
static const char *webp_message_from_status(VP8StatusCode status)
{
static const char *const known_message[] = {
/* Known codes as per libWebP 0.4.1 */
[VP8_STATUS_OUT_OF_MEMORY] = N_("out of memory"),
[VP8_STATUS_INVALID_PARAM] = N_("invalid parameter"),
[VP8_STATUS_BITSTREAM_ERROR] = N_("error in the bitstream"),
[VP8_STATUS_UNSUPPORTED_FEATURE] = N_("feature is not supported"),
[VP8_STATUS_SUSPENDED] = N_("operation suspended"),
[VP8_STATUS_USER_ABORT] = N_("aborted by user"),
[VP8_STATUS_NOT_ENOUGH_DATA] = N_("not enough data")
};
static char custom_message[128];
if (status >= 0 && status < sizeof(known_message) / sizeof(known_message[0]))
if (known_message[status] != NULL)
return known_message[status];
snprintf(custom_message, sizeof(custom_message),
_("unknow status code %d"), status);
return custom_message;
}
RImage *RLoadWEBP(const char *file_name)
{
FILE *file;
RImage *image = NULL;
char buffer[20];
int raw_data_size;
int r;
uint8_t *raw_data;
VP8StatusCode status;
WebPBitstreamFeatures features;
uint8_t *ret = NULL;
file = fopen(file_name, "rb");
if (!file) {
RErrorCode = RERR_OPEN;
return NULL;
}
if (!fread(buffer, sizeof(buffer), 1, file)) {
RErrorCode = RERR_BADIMAGEFILE;
fclose(file);
return NULL;
}
if (!(buffer[ 0] == 'R' && buffer[ 1] == 'I' && buffer[ 2] == 'F' && buffer[ 3] == 'F' &&
buffer[ 8] == 'W' && buffer[ 9] == 'E' && buffer[10] == 'B' && buffer[11] == 'P' &&
buffer[12] == 'V' && buffer[13] == 'P' && buffer[14] == '8' &&
#if WEBP_DECODER_ABI_VERSION < 0x0003 /* old versions don't support WEBPVP8X and WEBPVP8L */
buffer[15] == ' ')) {
#else
(buffer[15] == ' ' || buffer[15] == 'X' || buffer[15] == 'L'))) {
#endif
RErrorCode = RERR_BADFORMAT;
fclose(file);
return NULL;
}
fseek(file, 0L, SEEK_END);
raw_data_size = ftell(file);
if (raw_data_size <= 0) {
fprintf(stderr, _("wrlib: could not get size of WebP file \"%s\", %s\n"),
file_name, strerror(errno));
RErrorCode = RERR_BADIMAGEFILE;
fclose(file);
return NULL;
}
raw_data = (uint8_t *) malloc(raw_data_size);
if (!raw_data) {
RErrorCode = RERR_NOMEMORY;
fclose(file);
return NULL;
}
fseek(file, 0L, SEEK_SET);
r = fread(raw_data, 1, raw_data_size, file);
fclose(file);
if (r != raw_data_size) {
RErrorCode = RERR_READ;
free(raw_data);
return NULL;
}
status = WebPGetFeatures(raw_data, raw_data_size, &features);
if (status != VP8_STATUS_OK) {
fprintf(stderr, _("wrlib: could not get features from WebP file \"%s\", %s\n"),
file_name, webp_message_from_status(status));
RErrorCode = RERR_BADIMAGEFILE;
free(raw_data);
return NULL;
}
if (features.has_alpha) {
image = RCreateImage(features.width, features.height, True);
if (!image) {
RErrorCode = RERR_NOMEMORY;
free(raw_data);
return NULL;
}
ret = WebPDecodeRGBAInto(raw_data, raw_data_size, image->data,
features.width * features.height * 4,
features.width * 4);
} else {
image = RCreateImage(features.width, features.height, False);
if (!image) {
RErrorCode = RERR_NOMEMORY;
free(raw_data);
return NULL;
}
ret = WebPDecodeRGBInto(raw_data, raw_data_size, image->data,
features.width * features.height * 3,
features.width * 3);
}
free(raw_data);
if (!ret) {
fprintf(stderr, _("wrlib: failed to decode WebP from file \"%s\"\n"), file_name);
RErrorCode = RERR_BADIMAGEFILE;
RReleaseImage(image);
return NULL;
}
return image;
}
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